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I would like to just create a grid like this, but without numbers or color, but I'd like to represent an n × n grid abstractly with ellipses like this:

enter image description here

Also, I need just a simple—singular—grid like that of the top left grid in the image above.

I know need a red line (y=x) from the lower left corner to the upper right corner.

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Loie Benedicte
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    Welcome to TeX.SX! I added the picture you linked to the question. Later, with more reputation points earned, you will be able to do it yourself. Happy TeXing! :) – Count Zero Jul 25 '13 at 20:35
  • Would you rather do this as a table or as a tikzpicture (since you seem to have included both tags)? – MaxAxeHax Jul 25 '13 at 20:45
  • I included both tags so that the experienced answerer could choose between the easier of the two, but I would like to get a handle on tikz, so perhaps tikz is my answer. – Loie Benedicte Jul 25 '13 at 20:49
  • It could be done in a tabular, but the fact that the rules aren't continuous would cause for some ugliness. It's not that it's hard (once you get to grips with tabulars), it's just ugly. (The tabular solution would potentially be more efficient, but the TikZ solution is prettier by far.) – Sean Allred Jul 25 '13 at 23:06
  • I just know there is a good way to do this with ytableau; I just don't know what it is. The attempt has uncovered several potentially useful features I could add, though. – Ryan Reich Jul 26 '13 at 00:17

1 Answers1

22

A very basic approach using grid:

\documentclass{article}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
\draw (0,0) grid (3,3);
\draw (0,4) grid (3,7);
\draw (4,0) grid (7,3);
\draw (4,4) grid (7,7);
\foreach \i/\valor in {1/1,2/2,3/3,5/n-2,6/n-1,7/n}
  {
    \node[anchor=south] at (\i-0.5,7) {$\valor$};
    \node[anchor=east] at (0,-\i+7.5) {$\valor$};
}
\node at (3.5,1.5) {$\cdots$};
\node at (3.5,5.5) {$\cdots$};
\node at (1.5,3.5) {$\vdots$};
\node at (5.5,3.5) {$\vdots$};
\node at (3.5,3.5) {$\ddots$};
\end{tikzpicture}

\end{document}

enter image description here

With the new requirement of the edited question:

\documentclass{article}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
\draw (0,0) grid (3,3);
\draw (0,4) grid (3,7);
\draw (4,0) grid (7,3);
\draw (4,4) grid (7,7);
\foreach \i/\valor in {1/1,2/2,3/3,5/n-2,6/n-1,7/n}
  {
    \node[anchor=south] at (\i-0.5,7) {$\valor$};
    \node[anchor=east] at (0,-\i+7.5) {$\valor$};
}
\node at (3.5,1.5) {$\cdots$};
\node at (3.5,5.5) {$\cdots$};
\node at (1.5,3.5) {$\vdots$};
\node at (5.5,3.5) {$\vdots$};
\node at (3.5,3.5) {$\ddots$};
\draw[red,ultra thick] (0,0) -- (7,7);
\end{tikzpicture}

\end{document}

enter image description here

Gonzalo Medina
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